package org.shj.netty.chartper12;

import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.socket.DatagramPacket;
import io.netty.util.CharsetUtil;
import io.netty.util.internal.ThreadLocalRandom;

public class ChineseProverbServerHandler extends SimpleChannelInboundHandler<DatagramPacket>{
	
	private static final String[] DICTIONARY ={
		"只要功夫深，铁杵磨成针。", "旧时王谢堂前燕，飞入寻常百姓家。", "洛阳亲友如相问，一片冰心在玉壶。",
		"一寸光阴一寸金，寸金难买寸光阴。","老骥伏枥，志在千里；烈士暮年，壮心不已！"
	};
	
	private String nextQuote(){
		int quoteId = ThreadLocalRandom.current().nextInt(DICTIONARY.length);
		return DICTIONARY[quoteId];
	}
		
	protected void channelRead0(ChannelHandlerContext ctx, DatagramPacket packet) throws Exception{
		String req = packet.content().toString(CharsetUtil.UTF_8);
		System.out.println(req);
		
		if("谚语字典查询?".equals(req)){
			ctx.writeAndFlush(new DatagramPacket(Unpooled.copiedBuffer("谚语查询结果: " + nextQuote(), CharsetUtil.UTF_8), packet.sender()));
		}
	}
	
	public void channelReadComplete(ChannelHandlerContext ctx) throws Exception{
		System.out.println("channelReadComplete()");
		ctx.flush();
	}
		
	public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause){
		cause.printStackTrace();
		ctx.close();
	}
}
